BGP Configuration Guidelines > Configuring BGP to Select Multiple BGP Paths

You can configure BGP to select multiple non-multihop EBGP or IBGP paths as active paths. Selecting multiple paths allows BGP peerings to load-balance traffic across an AS-confederation boundary. The JUNOS BGP multipath supports the following:

• Load-balancing across multiple links between two routers belonging to different ASs
• Load-balancing across a common subnet or multiple subnets to different routers belonging to the same peer AS
• Load-balancing across multiple links between two routers belonging to different external confederation peers
• Load-balancing across a common subnet or multiple subnets to different routers belonging to external confederation peers

To configure a BGP multipath, include the multipath statement:

multipath {

    multiple-as; 

}

To disable the default check requiring that paths accepted by BGP multipath must have the same neighboring AS, include the multiple-as option.

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.